Research/Sitter/MAGNDATA / 1.25_KFe3(OH)6(SO4)2.mcif

KFe₃(OH)₆(SO₄)₂

MAGNDATA entry 1.25 · source

noncollinear antiferromagnet

All moments add up to a net magnetisation: an ordinary magnet. Spin splitting is the same in every direction (s-wave).

ordered ≤ 64 K (−209 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	R_I 3c BNS 167.108
Point group	3m1′
Parent space group	R 3m No. 166
Spins	coplanar · net moment 0 μ_B per cell
Propagation	[0 0 3/2] 1k
Cell	a 7.304 · b 7.304 · c 34.536 Å · α 90° · β 90° · γ 120°
Transition	64 K (−209 °C)
Measured at	10 K
Magnetic ions	Fe
Largest moment component	2.2 μ_B
Method	The model was chosen after considering 24 possible configurations.

Symmetry

Stereogram of the magnetic point group: each operation applied to one direction. Filled = upper hemisphere, ring = lower; red operations include time reversal. Lines are mirrors; polygons are 2/3/4/6-fold axes; the centre ring is inversion.

Every structure in R_I 3c →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
K1	K	0	0	0
S1	S	0	0	0.1542
Fe1	Fe	0.1667	−0.1667	−0.0833	2.2	−2.2	0	3.8105
O1	O	0	0	0.1967
O2	O	0.218	−0.218	−0.0272
O3	O	0.1247	−0.1247	0.0675

Moment components are along the crystal axes a, b, c (μ_B), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

T. Inami et al. Journal of Magnetism and Magnetic Materials (1998) · doi:10.1016/s0304-8853(97)00986-4

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.25_KFe3(OH)6(SO4)2.mcif from MAGNDATA · entry page

sha256 of this copy: 8a9611b3c23e36e90adeb1a3030dddd6a22564f54da5fa87f078e2017362d167
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.25_KFe3(OH)6(SO4)2.mcif.